import _curry1 from "./internal/_curry1.js";
import _has from "./internal/_has.js";
import _isArguments from "./internal/_isArguments.js"; // cover IE < 9 keys issues

var hasEnumBug = ! /*#__PURE__*/ Object.prototype.propertyIsEnumerable.call({
  toString: null,
}, "toString") 
var nonEnumerableProps = ['constructor', 'valueOf', 'isPrototypeOf', 'toString', 'propertyIsEnumerable', 'hasOwnProperty', 'toLocaleString']; // Safari bug

var hasArgsEnumBug = /*#__PURE__*/function() {
  'use strict';
  return Object.prototype.propertyIsEnumerable.call(arguments, 'length');
}();

var contains = function contains(list, item) {
  var idx = 0;

  while (idx < list.length) {
    if (list[idx] === item) {
      return true;
    }

    idx += 1;
  }

  return false;
};
/**
 * Returns a list containing the names of all the enumerable own properties of
 * the supplied object.
 * Note that the order of the output array is not guaranteed to be consistent
 * across different JS platforms.
 *
 * @func
 * @memberOf R
 * @since v0.1.0
 * @category Object
 * @sig {k: v} -> [k]
 * @param {Object} obj The object to extract properties from
 * @return {Array} An array of the object's own properties.
 * @see R.keysIn, R.values
 * @example
 *
 *      R.keys({a: 1, b: 2, c: 3}); //=> ['a', 'b', 'c']
 */


var keys = typeof Object.keys === 'function' && !hasArgsEnumBug ? /*#__PURE__*/_curry1(function keys(obj) {
  return Object(obj) !== obj ? [] : Object.keys(obj);
}) : /*#__PURE__*/_curry1(function keys(obj) {
  if (Object(obj) !== obj) {
    return [];
  }

  var prop, nIdx;
  var ks = [];

  var checkArgsLength = hasArgsEnumBug && _isArguments(obj);

  for (prop in obj) {
    if (_has(prop, obj) && (!checkArgsLength || prop !== 'length')) {
      ks[ks.length] = prop;
    }
  }

  if (hasEnumBug) {
    nIdx = nonEnumerableProps.length - 1;

    while (nIdx >= 0) {
      prop = nonEnumerableProps[nIdx];

      if (_has(prop, obj) && !contains(ks, prop)) {
        ks[ks.length] = prop;
      }

      nIdx -= 1;
    }
  }

  return ks;
});
export default keys;